Does Apple's Audio MIDI Setup.app (found in your Utilities Folder) show your MIDI interface/keyboard?

There are two windows, one for Audio Devices and another for MIDI Studio. If your MIDI controller does not show up there, then your Mac is not seeing it. Below you'll see mine with the only MIDI device I have on at the moment.

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BIAB 2026 Audiophile Mac
24Core/60CoreGPU M2 MacStudioUltra/8TB/192GB Sequoia/Tahoe, M1 & M5 MBAir, 2012 MBP
Digital Performer11, Logic, Finale27/Dorico/Encore/SmartScore/Notion/Overture